Compact water heating and treatment system

ABSTRACT

A water heating and treatment system includes a water heater operatively coupled to a water heater controller, a hot water outflow line from the water heater, and a cold water supply line to supply water to the water heater. The cold water supply line includes at least one of an anti-scale device operatively coupled to an anti-scale device controller, and at least one sanitation device operatively coupled to a sanitation device controller. The mixing station is operatively coupled to a mixing station controller. The mixing station supplies heated water to at least a first temperature zone at a first hot water temperature. Controllers of the water heater controller, the anti-scale device controller, the sanitation device controller and the mixing station controller are co-located at a front of a single enclosure behind an openable door, the controllers operatively coupled to a supervisory controller.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of, and claims priority to and the benefit of co-pending U.S. patent application Ser. No. 17/653,339, COMPACT WATER HEATING AND TREATMENT SYSTEM, filed Mar. 3, 2022, co-pending U.S. patent application Ser. No. 16/595,781, UV LAMP AND ANTI-SCALE WATER TREATMENT WATER HEATER APPARATUS WITH SANITATION LOOP, filed Oct. 8, 2019, and U.S. patent application Ser. No. 16/196,538, UV LAMP AND ANTI-SCALE WATER TREATMENT WATER HEATER APPARATUS WITH SANITATION LOOP, filed Nov. 20, 2018, which applications are incorporated herein by reference in their entirety.

FIELD OF THE APPLICATION

The application relates to sanitization of water and particularly to sanitization of water in a water heater and treatment system.

BACKGROUND

Legionnaires' disease from bacteria vaporized by evaporation from contaminated waters contaminated with Legionella germs is a well-known risk. As described, for example, by the Centers for Disease Control and Prevention (CDC), in the June 2016 issue of Vitalsigns™, “Legionella grows best in building water systems that are not well maintained. Building owners and managers should adopt newly published standards that promote Legionella water management programs, which are ways to reduce the risk of this germ in building water systems”.

SUMMARY

A water heating and treatment system includes a water heater operatively coupled to a water heater controller, a hot water outflow line from the water heater, and a cold water supply line to supply water to the water heater. The cold water supply line includes at least one of an anti-scale device operatively coupled to an anti-scale device controller, and at least one sanitation device operatively coupled to a sanitation device controller. A mixing station supplies a temperature regulated heated water to one or multiple temperature zones. The mixing station is fluidly coupled to the cold water supply line and to the hot water outflow line from the water heater. The mixing station is operatively coupled to a mixing station controller. The mixing station supplies heated water to at least a first temperature zone at a first hot water temperature. Controllers of the water heater controller, the anti-scale device controller, the sanitation device controller and the mixing station controller are co-located at a front of a single enclosure behind an openable door, the controllers operatively coupled to a supervisory controller.

The supervisory controller can be disposed in the openable door. A display screen of the supervisory controller can be viewable when the openable door is closed.

A display screen of the supervisory controller can display at least one graphical user interface showing a symbol representative of a plurality of components of components of the water heating and treatment system selected from: the water heater, the anti-scale device, the at least one sanitation device and the mixing station.

The at least one graphical user interface can show an operating parameter of each of the components. The operating parameter can be displayed adjacent to the symbol representative of a plurality of components of components of the water heating and treatment system selected from: the water heater, the anti-scale device, the at least one sanitation device and the mixing station. The sanitation device can include a UV sanitation lamp.

A water heating and treatment system includes a water heater, a hot water outflow line from the water heater, a cold water supply line to supply water to the water heater, the cold water supply line including at least one of an anti-scale device, and a sanitation device. A mixing station supplies a temperature regulated heated water to one or multiple temperature zones, the mixing station fluidly coupled to the cold water supply line and to the hot water outflow line from the water heater, the mixing station to supply heated water to at least a first temperature zone at a first hot water temperature. A three-way return water diverter valve including a proportional three-way return water diverter valve is fluidly coupled to the mixing station via one or more sanitation components. An operation of the three-way return water diverter valve is based on a differential temperature between a first temperature zone temperature sensor and a hot water recirculation temperature sensor.

The proportional three-way return water diverter valve can be fluidly coupled to a drain or to another use, via a drain line or a diverted water line, the three-way return water diverter valve to provide a portion of a re-circulated hot water from a hot water recirculation line including a hot water recirculation temperature sensor to the mixing station and a remaining portion of the re-circulated hot water to the drain. The sanitation device can include a UV sanitation lamp.

A water heating and treatment system includes a water heater, a hot water outflow line from the water heater, a cold water supply line to supply water to the water heater, the cold water supply line including at least one of an anti-scale device, and a sanitation device. A mixing station supplies a temperature regulated heated water to one or multiple temperature zones, the mixing station fluidly coupled to the cold water supply line and to the hot water outflow line from the water heater, the mixing station to supply heated water to at least a first temperature zone at a first hot water temperature. A pressure sensor is disposed across each sediment filter to measure a differential pressure. A media replacement alert is generated if the differential pressure drop exceeds a set point.

The media replacement alert can be sent to a water heater controller. The water heater controller can be operatively coupled to a supervisory controller and the media replacement alert is displayed on a display of the supervisory controller. The sanitation device can include a UV sanitation lamp.

A water heating and treatment system includes a water heater, a hot water outflow line from the water heater, a cold water supply line to supply water to the water heater, the cold water supply line including at least one of an anti-scale device, and a sanitation device. A mixing station supplies a temperature regulated heated water to one or multiple temperature zones. The mixing station is fluidly coupled to the cold water supply line and to the hot water outflow line from the water heater, the mixing station to supply heated water to at least a first temperature zone at a first hot water temperature. Water temperatures within the water heating and treatment system are measured by any combination of a plurality of temperature sensors including: a temperature sensor at a cold-water inlet, a temperature sensor at a recirculation water line, a temperature sensor near an inlet of the water heater, a temperature sensor at a hot water outlet, and a temperature sensor at a heated water outlet of the at least a first temperature zone.

A sanitation pump process can be based on temperature readings of the combination of a plurality of temperature sensors. A thermal disinfection process can be based on temperature readings of the combination of a plurality of temperature sensors. A scald protection process can be based on temperature readings of the combination of a plurality of temperature sensors. The sanitation device can include a UV sanitation lamp.

The foregoing and other aspects, features, and advantages of the application will become more apparent from the following description and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The features of the application can be better understood with reference to the drawings described below, and the claims. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles described herein. In the drawings, like numerals are used to indicate like parts throughout the various views.

FIG. 1 is a schematic diagram showing an exemplary UV lamp and anti-scale water treatment water heater apparatus with sanitation loop according to the Application;

FIG. 2 is a diagram showing recommended sanitation temperatures and times;

FIG. 3 shows a drawing of an exemplary self-enclosed, single cabinet implementation of the apparatus of FIG. 1;

FIG. 4A is a schematic diagram showing another exemplary UV lamp and anti-scale water treatment water heater apparatus with sanitation loop according to the Application including a three-way return water diverter valve; and

FIG. 4B is a schematic diagram showing detail “A” of FIG. 4A.

FIG. 5 is a drawing showing an exemplary hot water wellness solution UV lamp and anti-scale water treatment water heater apparatus with sanitation loop according to the Application having a transparent wall with sliding doors;

FIG. 6 is a drawing showing an isometric view of an exemplary UV lamp and anti-scale water treatment water heater apparatus with sanitation loop with the front door open;

FIG. 7 is a drawing showing a front view of the apparatus of FIG. 6;

FIG. 8 is a drawing showing an elevated rear view of the apparatus of FIG. 6;

FIG. 9A is a drawing showing a perspective view of a bare cabinet without installed components and the front door closed of the apparatus of FIG. 6;

FIG. 9B is a drawing showing a perspective view of a bare cabinet without installed components and the front door open of the apparatus of FIG. 6;

FIG. 10 is a drawing showing an exemplary installation of two of the apparatus of FIG. 6 side by side.

FIG. 11 is a drawing showing a summary schematic of the water heating and treatment system described hereinabove;

FIG. 12 is a drawing showing an exemplary block diagram of the subsystem controllers which are communicatively coupled to a main supervisory controller;

FIG. 13 is a drawings showing an exemplary water heating and treatment system according to the Application where the controllers have been mounted in the front of the cabinet, just behind the front door;

FIG. 14 is a drawing of an exemplary system status graphical user interface (GUI) displayed on the supervisory controller; and

FIG. 15 is a drawing of another exemplary system status graphical user interface (GUI) displayed on the supervisory controller.

DETAILED DESCRIPTION

As described hereinabove, Legionnaires' disease from bacteria vaporized by evaporation from contaminated waters contaminated with Legionella germs is a well-known risk. Water heaters, including low volume instantaneous hot heater heaters, pose a significant risk if mitigation techniques are not in place. Associated cold water supply lines and hot water distribution systems are also at risk from contamination by pathogens such as Legionella, bacteria, and other undesirable microorganisms in a domestic hot water system.

One method to substantially eliminate Legionella and other pathogens is to heat the water to a sufficient temperature for a sufficient amount of time. One method of the prior art is to heat water in a system to about 50° C. to 60° C. for about an hour. However, such sanitation methods can also cause several problems. Bulk heating of the water in the system for sanitation reasons uses significantly more energy consumption than might otherwise be used. Also, the overall system or parts of the system may need to be removed from service during periods of elevated water temperatures used for system sanitation cycles. More recently, it has been found that further elevated water temperatures above 151° F. (66° C.) or higher can be effective in at least about two minute sanitation cycles. However, the energy cost compared normal lower hot water temperature should still be considered.

In recent years, sanitation by ultraviolet light has become more effective and more widely used. One advantage of UV sanitation is that the UV light can be operated continuously to treat water at one or more key point in domestic hot water system, such as, for example, in a cold water supply line, and also in a recirculating water return line.

Pathogens also accumulate in scale formation at various places in a domestic hot water system and heater. There have been efforts related to water hardness to mitigate scale formation to prevent failure and premature aging of various water system components. Scale buildup has also been found to be a gross vector for pathogens such as Legionella. Scale deposits provide a place where pathogens such as biofilms can adhere. There should also be efforts to mitigate scale formation to substantially prevent habitats for pathogens.

Anti-scale technologies, such as, for example, the OneFlow® anti-scale system, available from Watts Water Technologies, Inc. of North Andover, Mass., can be employed as part of a pathogen suppression program. Anti-scale systems are distinguished from water softening devices and systems which are less or not effective at preventing scale buildup as part of a pathogen suppression or mitigation program. U.S. Pat. No. 9,879,120 B2, RESIN FOR PRECIPITATION OF MINERALS AND SALTS, METHODS OF MANUFACTURE AND USES THEREOF, assigned to Watts Water Technologies Inc., describes a method of producing a scale-control resin including an aqueous solution a cation-exchange resin and a weak-acid anion mineral or salt having a multivalent cation to allow ion exchange between the resin and the multivalent cation. The cation-exchange resin may be a weak-acid ion exchange resin. The method may further include adding a strong-acid salt having the same multivalent cation as the weak-acid anion mineral or salt to the aqueous solution. U.S. Patent Application Ser. No. 62/675,898, QCM MEASUREMENT OF SCALE FORMATION, describes an exemplary water hardness mitigation or treatment evaluation system and method to evaluate the effectiveness of a water hardness mitigation or treatment evaluation system. Such exemplary techniques can be used to develop a fault indication for an anti-scale apparatus which can be received by a controller, such as the water heater controller, similar to a fault from a UV lamp device. The '120 patent and '898 application are incorporated herein by reference in their entirety for all purposes.

The addition of UV sanitation and/or water treatment products, such as the OneFlow® products in a domestic hot water system can provide sufficient treatment and pathogen mitigation alone. Because the energy consumption of such systems is relatively small (e.g. the power to run one or more UV lamps, or the power to monitor operation of a water treatment system which is negligible), domestic hot water sanitation can be now accomplished without the higher cost for the additional energy consumption used to raise the temperature of the water for sanitation by elevated water temperature. Exemplary suitable UV sanitation systems have been described in U.S. Pat. No. 9,738,547 B2, ULTRAVIOLET LIGHT SANITIZING ASSEMBLY WITH FLOW SWITCH AND KEYED LAMP, and U.S. Pat. No. 9,932,245 B2, UV SANITIZING ASSEMBLIES WITH HIGH DOSE FEATURES AND METHODS FOR CONTROLLING THE SAME, both assigned to Watts Water Technologies, Inc. The '547 and '245 patents are incorporated herein by reference in their entirety for all purposes.

More advanced UV sanitation systems offer fault indications, typically via a local component controller which can also be in communication with a building controller, such as, for example, a system programmable logic controller and/or directly in communication with the water heater controller (e.g. a processor or microcomputer based controller). Faults, such as, a UV lamp failure can be displayed or alarmed locally and/or through a building controller system. Unfortunately, it is common for many such domestic hot water systems to continue to provide water to end users, including sinks and showers, sometimes for relatively long periods of time, before a defective UV lamp or other sanitation device is realized to be defective and/or there can be a delay until the failed device is repaired. Failure of timely maintenance and repair of water sanitization components might be caused by a lack of routine system and maintenance checks, a delay in calling for the repair, a lack of spare parts on hand, or carelessness by a building owner. After some period of time without device repair or replacement, the domestic hot water system can become vulnerable to contamination by pathogens, as if the failed remediation equipment had never been installed.

There is a need for a water heating and treatment, system and method which can effectively suppress pathogens, including undesired bacterial content, in a domestic hot water system with some degree of certainly, even where one or more sanitation device has failed or is otherwise inoperative.

It was realized that by incorporating advanced pathogen mitigation devices as part of a water heating system, that an elevated temperature water heater sanitation loop can be programmatically operated on schedule, and/or operated on a fault indication from a sanitation device, such as a UV lamp or anti-scale device communicatively coupled to a controller of the water heater. Where the controller of the water heater has such fault information, the controller can include a process to automatically invoke a backup or failsafe sanitation routine following notification of a fault by one or more of the system sanitation devices.

Scheduled operation of a sanitation loop: On a predetermined schedule, the controller of the water heater can command the water heater (e.g. as by modulating the burner heat output of a gas fired water heater, as controlled by the water heater controller) to an elevated temperature for a desired period of time as a scheduled backup or failsafe sanitation operation.

Operation of a sanitation loop in response to a fault detection: On notification from one or more sanitation devices that the sanitation device has failed (e.g. a failed UV lamp), the controller of the water heater can command the water heater (e.g. as by modulating the burner heat output of a gas fired water heater, as controlled by the water heater controller) to an elevated temperature for a desired period of time. For example, there can be scheduled at a predetermined interval or intervals, 2 minute temperature rises of the hot water in the water heater to above 151° F. The sanitation effectiveness of periods of elevated hot water temperature can be enhanced by a water flow through the water heater, such as a water flow caused by a close-in bypass loop which includes a sanitation pump.

In one exemplary embodiment, the water heater includes a sanitation bypass sanitation loop with a sanitation loop pump. Either on a pre-programmed schedule and/or following notice of a sanitation device failure from the failed device, the water heater controller runs a sanitation process, where the sanitation loop is activated (including activation of the sanitation loop pump) and the temperature of the water in the heater is raised by the water heater to an elevated temperature for an appropriate time, for that elevated temperature, to kill pathogens. For example, using currently best understood sanitation techniques, the water heater can increase the temperature in the water heater to above 151° F. in one or periodic cycles lasting at least two minutes. Such water heater cycles can be performed by any suitable number of times during a day and repeated as for as long as is needed until the fault indication from the sanitation device goes away or is otherwise reset. As described hereinabove, there can also be sanitation cycles run on a predetermined schedule, even in the absence of sanitation device fault indications, as a backup or failsafe mode of operation for a more certain pathogen suppression. An entire sanitation cycle, including heating the water to above 151° F. and at least 2 minutes of relatively high water velocity (high flow rate) through the sanitation loop at the elevated temperature above 151° F.

Some hot water distribution lines may be able to continue to operate normally without any additional manual or automatic operations during the times of elevated hot water temperature. For example, some high temperature water users, such as, for example, some industrial type washers and dishwashers can run normally even with periods of elevated hot water temperatures such as can result from operation of the sanitation loop (where there is no mixing valve in the hot water distribution line). Other hot water distribution systems cannot tolerate an elevated hot water supply at the sanitation temperature, such as, for example, hot water to building sinks and showers. However, water to those “low temperature” hot water distribution lines can be supplied through a mixing system, such as, for example a digital mixing system, where cold water is automatically injected into the distribution line to ensure that the desired hot water temperature, typically about 120° F. is provided, despite any short term operation of a sanitation loop at the water heater causing higher than normal water temperature of the hot water in the water heater as well as the hot water at the water heater outlet line.

There can also be either a single or a multiple mixing station which supplies heated water to one or multiple temperature zones. The single or multiple mixing station is fluidly coupled to the cold water supply line and to a hot water outflow line from the water heater. The single or multiple mixing station supplies heated water to at least a first temperature zone at a first hot water temperature.

FIG. 1 shows a schematic diagram of an exemplary UV lamp and anti-scale water treatment water heater apparatus with sanitation loop 100 for suppression of pathogens including undesired bacterial content in a domestic hot water system (i.e. mitigation of pathogens such as Legionella in potable water systems) according to the Application. Cold or cool water 181 enters UV lamp and anti-scale water treatment water heater apparatus with sanitation loop 100 from a source of potable cold water 181 (e.g. a municipal domestic hot water utility source as distributed within a building) passing through a sediment filter (A) 171, anti-scale system 141 and UV water treatment lamp (A) 137 to ensure that substantially no waterborne pathogens are introduced to the water heater 110 from the municipal supply. The anti-scale system 141 is placed before the UV lamp 137 to substantially prevent scale formation or build up in the UV lamp. The anti-scale system 141 also prevents scale formation in the water heater 110. Booster pump 153 can provide a desired water pressure and flow rate for the cold water inlet supply line. Cold water 181 is provided to the hot water 110 (of any suitable domestic hot water heater, form clarity of illustration, not shown in detail in FIG. 1) via cold water line 196, one way valve 163 (which prevents hot water from the sanitation loop from flowing into the cold water lines), and line 193 which doubles for cold water supply, and to provide the return line for the sanitation loop 101.

One suitable anti-scale system is the OneFlow® anti-scale system available from Watts Water Technologies, Inc. of North Andover, Mass. Water heater 110 can be a part of a water heater device such as, for example, any suitable water heater available from PVi™ of Fort Worth, Tex., or from AERCO International, Inc. of Blauvelt, N.Y.

Water is heated to the desired setpoint and delivered to an integral mixing valve such as a digital mixing station 160. Suitable digital mixing stations include, for example, the IntelliStation™ available from POWERS™ (Watts Water Technologies, Inc.) of North Andover, Mass. Principles of mixing have been described, for example, in U.S. Pat. No. 9,122,284 B2, Electromechanical temperature regulation system for providing tempered mix water, assigned to PVI Industries Inc. (Watts Water Technologies, Inc.). Hot water from water heater 110 is provided to the mixing station 160 via one way valve 161, and hot water lines 191 and 194 to provide the “first temperature” hot water 131 supply. Digital mixing station 160 is used for tempering water to a controlled temperature hot water supply, shown in FIG. 1 as LT supply 131. Hot water is supplied directly to the high temperature water system, shown in FIG. 1 as HT supply 133.

Any suitable water heater 110 can be used. It is unimportant whether a source of heat, heats the water in the water heater directly (e.g. some types of electrical heating elements), or if there is a heat exchanger, such as, for example, where a hot combustion gas flows through tubes that run through a water heater to heat the water. It is also unimportant what type of fuel is used. While in commercial water heaters, gas burning burners are common, the same system and processes described by the Application can be implemented with electric, oil, direct, or indirect heat exchangers, including steam or non-potable boiler water heaters.

Exemplary suitable heat exchanger units include a plate and frame heat exchanger heater used with boiler water on one side and domestic hot water heater on the other side. The higher temperature boiler water heats the domestic hot water to the desired hot water temperature. Steam heating can also be used, such as where steam runs through pipe with water flowing around the pipe in a shell. For example, the water heater can include an indirectly fired heat exchanger, such as a plate and frame heat exchanger, a brazed plate heat exchanger, or a shell and tube heat exchanger. Or, the water heater can include an indirectly fired steam heated heat exchanger, such as a brazed plate heat exchanger, or a shell and tube heat exchanger.

Other suitable water heaters include gas fired water heaters, such as those with a modulated burner. Electrical elements, such as, for example, coiled electrical heating elements can also be used to more directly heat the water in an instantaneous type water heater. It is understood that water heaters as described hereinabove typically include any suitable water heater controller (e.g. controller 201, FIG. 1).

Controller 201 is typically, but not necessarily, the same as the controller of the water heater 110 via communication line 203. Controller 201 is communicatively coupled to UV water treatment lamp (A) 137 via communication line 205, anti-scale system 141 via communication line 209, and/or UV water treatment lamp (B) 135 via communication line 207. Similarly, controller 201 can be communicatively coupled via communication line 211 to any suitable communication lines to peripherals, such as, for example, one or more displays or indicators (not shown in FIG. 1) and/or any suitable wired or wireless connections (e.g. Bluetooth, WIFI, etc., to any other suitable computers or controllers. Communication lines 203, 205, 207, 209 and/or 211 can be any suitable wired or wireless connections of any suitable hardwired control wires, hardwired communication bus or protocol, any suitable wireless connection and/or any combination thereof.

Sediment filters 171, 173 can remove undesired particulate matter before it enters the parts of the UV lamp and anti-scale water treatment water heater apparatus with sanitation loop 100 at either the cold water inlet or the recirculation water inlet. Any suitable sediment filter can be used.

Recirculation water is water that has gone out to a building hot water distribution system, but that was not used at any of the fixtures, or devices and which can be returned via a UV lamp and anti-scale water treatment water heater apparatus with sanitation loop 100 as “unused” hot water. In the exemplary system of FIG. 1, building recirculation water is brought back to the UV lamp and anti-scale water treatment water heater apparatus with sanitation loop 100 via sediment filter (B) 173 and UV water treatment lamp (B) 135, to ensure that substantially no waterborne pathogens are introduced to the system from the building hot water distribution lines and fixtures. Recirculated hot water 183 is distributed directly back into the water heater via line 195 for reheating and reuse, and to the mixing valve 160 via one-way check valve 165 and line 199.

Chemical injection ports 181, 183 (e.g. for chlorine dioxide) can be optionally used to further treat the outgoing hot water from the water heater. Chemicals such as chlorine dioxide are preferably introduced downstream of the heat exchanger so that they do not deteriorate the heat exchanger structure.

FIG. 2 is a diagram showing recommended sanitation temperatures and times sanitation Loop Sequence of Operation. The Diagram shows how several Legionella species, including Legionella pneumophila, respond to water temperatures in a laboratory setting. In an actual hot-water system, legionellae may multiply at temperatures well above 1220° F. because of scale, biofilm and other complexities (Legionellae Control in Health Care Facilities: A Guide for Minimizing Risk, Matthew Freije, H C Info, as reprinted in Understanding Potential Water Heater Scald Hazards A White Paper Developed by the ASSE International Scald Awareness Task Group, May 2013).

Sanitation loop—When enabled, the UV lamp and anti-scale water treatment water heater apparatus with sanitation loop 100 resets the setpoint temperature of the water heater from a normal operational setting (e.g. typically about 120° F. to 140° F.), up to about 160° F. As part of the sanitation or sanitation loop 101, circulating pump 151 pumps water from the supply connection 191 through pipe 192 to the cold inlet connection 193 and continues until the water within water heater 110 temperature exceeds above 151° F. (66° C.) and holds for at least 2 minutes, per the water treatment recommendations of FIG. 2.

Suitable water flow rates for the sanitation loop range as caused by the sanitation pump in the sanitation bypass loop are generally at least about the GPM flow rate of the water heater in normal operation, or higher. Note that a sanitation loop is distinct from bypass loops of the prior art which are used for temperature regulation and other applications, such as continuous water circulation or condensation reduction in the water heater. Such bypass loops use relatively small diameter pipes, and much lower flow rates, not suitable for the new sanitation loop described hereinabove.

Example: A water heater includes a sanitation loop as described hereinabove using a 2″ pipe diameter and a ⅓ hp pump to achieve a sanitation loop flow rate of about 80 GPM. Typically, the pump and sanitation loop pipe should be large enough to support a flow greater than the normal flow of heated water from the water heater (i.e. as related to the heat capacity of the water heater).

When complete, the setpoint can be returned to the pre-sanitation loop normal operating temperature and the heated water will be delivered to the mixing valve 160, and where used, to the high temperature system water 133 supply. Optionally, a blow down valve 121 may be opened, during both automatic and manual sanitation loop operation, to connect water heater 110 to drain and rapidly return the heater supply to normal operational temperature settings. The sanitation loop function can be scheduled for periodic operation (e.g. at regular or irregular time intervals) and/or manually operated based on a maintenance alarm, such as, for example, a fault indication from a water quality or water treatment device, such as a UV lamp fault or an anti-scale fault indication.

Automatic Blowdown Sequence of Operation—In some embodiments, an auto-blowdown feature can automatically drain any sediment that may have settled to the bottom of the heater 110 by operation of the blow down valve 121. Once complete the blow down valve can be closed and the unit placed back into its standard sequence of operation. An automatic blowdown sequence can be programmed to be performed on a regular or irregular schedule and/or on a more frequent operating schedule, such as, for example, in response to a fault condition, such as, for example, a fault indication from the anti-scale system. Such anti-scale system fault indications are being developed for commercialization, such as, for example, the QCM system described in the '898 application reference to hereinabove.

FIG. 4A is a schematic diagram showing another exemplary UV lamp and anti-scale water treatment water heater apparatus with sanitation loop according to the Application. The UV lamp and anti-scale water treatment water heater apparatus of FIG. 4A and FIG. 4B includes a three-way diverter valve 501 in the recirculation line 183 which allows the apparatus under certain circumstances, to send all or a portion of the recirculated water to a drain 505 via drain line 503 or for another use via diverter line 504. Temperature sensors in FIG. 4A and FIG. 4B are shown in a rectangular schematic box marked by a “T” with designators such as I-40, and I-41. Any suitable analog or digital temperature sensors can be used, such as, for example, an analog or digital (Resistance Temperature Detector) RTD, or analog or digital thermistors.

FIG. 4B is a schematic diagram showing detail “A” of FIG. 4A. Three-way diverter valve 501 is typically operatively coupled to controller 201, such as, by communications line 513 which can be any suitable wired or wireless connections of any suitable hardwired control wires, hardwired communication bus or protocol, any suitable wireless connection and/or any combination thereof.

Over Temperature Protection—Over Temperature Protection is useful for typical operation, such as, where the high and tempered return lines are combined and connected to the systems recirculation line.

Anti-Scald System—An optional anti-scald system can be used to offer scald protection for building occupants where the recirculation temperature exceeds the tempered water system temperature setpoint. In the exemplary system of FIG. 4A and FIG. 4B, the tempered water (LT supply) is delivered by a digital mixing station 160, such as, for example, by use of an IntelliStation Jr™, available from POWERS™. Valve open and valve closed setpoint temperatures for the three-way return water diverter valve 501 can be set by user at a controller such as controller 201 or another interface device (e.g. a smartphone communicatively coupled to controller 201 by any suitable means, such as, for example, Bluetooth™, WIFI, Internet, etc.) operatively coupled. Operation of the three-way return water diverter valve 501 by a controller can also be based on the differential temperature between the tempered supply temperature sensor and the recirculation temperature sensor.

By partially opening the three-way return water diverter valve 501 (e.g. a modulating 3-way valve), to divert some returning water to the drain line 503 or diverted water line 504, an artificial demand can be placed on the system. Cold water can also be drawn into the digital mixing station 160 for mixing down to the tempered supply temperature.

Shock Treatment Options—Shock treatment options include temperature shock and chemical shock. Shock treatment options are useful for when installing in a retrofit application, or when an infection event has occurred. These are temporary unscheduled actions that are typically entered manually. Temperature Shock—To cause a temperature shock, the digital mixing station 160 can be placed into a sanitation mode where the delivery temperature is increased to temperatures known to reduce bacterial populations in the system piping. Chemical Shock—To cause a chemical shock, one or more of the chemical injection ports can be used to introduce very high doses of water treatment chemicals for a system flush or infection event.

Shock Protection—In the case of either a thermal shock treatment or a chemical shock treatment of a building piping system, substantially all of the water returning to the water heater and treatment device can be drained to protect components from exposure to high concentrations of chemical treatment and to allow the piping system to rapidly return to safe temperature below scalding levels. By fully opening the three-way return water diverter valve 501 during a shock protection event, substantially all of the retuning water can be diverted to drain 505.

Diverted water—In some installations such as exemplary water heating and treatment system with UV lamp and anti-scale water treatment sanitation for suppression of pathogens and undesired bacterial content in domestic hot water systems as described hereinabove, diverted water is diverted to a drain, via a drain line. However, in other installations, there can be another use of diverted warm or hot water, as designated by site personnel for the diverted hot or warm water (as opposed to the diverted water being sent directly to a drain via a drain line). In such alternate use cases, the diverted water can be alternatively piped to the other application to be used before later being drained after the alternate use, or to an end use which otherwise consumes and/or evaporates the diverted water. Where a diverted water line is used to pipe diverted water to another alternate use, the diverted water line takes the place of the drain line in the exemplary systems shown in the drawings.

Generally, the addition of a proportional three-way return water diverter valve provides more flexibility and options on how to use the re-circulated water. Typically, in a normal operation of the system, substantially all of the recirculated water is returned to the mixing station, such as in the exemplary system of FIG. 4A, via a UV water treatment lamp and a sediment filter. During an overtemperature condition, the proportional three-way return water diverter valve can return 0% to 100% portion of the recirculated water to the system, the remainder being diverted to a drain or to another use. Note that during some overtemperature conditions, depending on the allowed variation of particularly the LT supply (sometimes referred to as the first temperature hot water supply hereinabove), a facility manager can still optionally allow substantially all of the recirculated water to be returned to the mixing station. However, during a shock treatment operation, substantially all of the re-circulated water (i.e. 90%-100%) is diverted to the drain, or optionally to another use (where the other use can tolerate the shock treated water).

Controller—the water heater can include any suitable controller, typically a processor based controller. The processes described hereinabove can be performed by the water heater controller or another controller operatively coupled to the water heater controller. The controller can be based on any suitable embedded processor or embedded computer. The water heater control can monitor and report the status and faults of the UV fluency and Mixing Valve, as well as perform standard water heater operational functions. Similarly, the mixing station can include its own controller operatively coupled to the controller which is carrying out any of the processes described hereinabove.

The UV lamp and anti-scale water treatment water heater apparatus with sanitation loop of FIG. 1 can be built into a single enclosure as a compact self enclosed apparatus. FIG. 3 shows a drawing of an exemplary self enclosed, single cabinet implementation of the apparatus of FIG. 1. FIG. 5 is a drawing showing an exemplary hot water wellness solution UV lamp and anti-scale water treatment water heater apparatus with sanitation loop according to the Application having a transparent wall with sliding doors.

Applications of the UV lamp and anti-scale water treatment water heater apparatus with sanitation loop of FIG. 1 include domestic hot water installations for critical healthcare facilities such as hospitals, and in the hospitality areas, including, for example, restaurants, resorts, and hotels.

Instantaneous water heaters have relatively small volumes of heated water, and hot water tanks are no longer used or at least are less common in modern water heating applications and installations. However, those skilled in the art will recognize that the same techniques of a UV lamp and anti-scale water treatment water heater apparatus with sanitation loop as described by the Application, can be applied to hot water tanks of a hot water system. While present trends are towards water heaters that heat water on demand (e.g. instantaneous water heaters as used in the exemplary systems described hereinabove), those skilled in the art will also recognize that the same techniques of a UV lamp and anti-scale water treatment water heater apparatus with sanitation loop as described by the Application can also be applied to tank type water heaters.

Suitable wired communications include direct wired contact controls and/or analog voltages or currents including current loop standards, serial standards, such as RS-485, ethernet connections, etc. Suitable wireless connections include, for example, Bluetooth™ WIFI, Internet, etc.

FIG. 6 is a drawing showing an isometric view of an exemplary UV lamp and anti-scale water treatment water heater apparatus with sanitation loop with the front door open. FIG. 7 is a drawing showing a front view of the apparatus of FIG. 6. FIG. 8 is a drawing showing an elevated rear view of the apparatus of FIG. 6. FIG. 9A is a drawing showing a perspective view of a bare cabinet without installed components and the front door closed of the apparatus of FIG. 6. FIG. 9B is a drawing showing a perspective view of a bare cabinet without installed components and the front door open of the apparatus of FIG. 6.

FIG. 10 is a drawing showing an exemplary installation of two of the apparatus of FIG. 5 side by side. A plurality of pipe connections passing through a rear panel 1010 of the single enclosure 600 (FIG. 6) can include a natural gas pipe 1011 passing through a top of the rear panel 1010 of the single enclosure 600. The plurality of pipe connections passing through a rear panel of the single enclosure can include the cold water supply line 181 passing through the rear panel 1010 of the single enclosure 600. The plurality of pipe connections passing through a rear panel of the single enclosure can include the hot water outflow line 131 from the water heater 110 passing through the rear panel of the single enclosure 600. The plurality of pipe connections passing through a rear panel of the single enclosure can include a heated water line 133 from the water heater passing through the rear panel 1010 of the single enclosure.

The water heating and treatment system can further include a recirculated hot water distributed directly back into the water heater via a line for reheating and reuse, and to the mixing station, and wherein the plurality of pipe connections passing through a rear panel of the single enclosure can include a recirculated water line 183 passing through the rear panel 1010 of the single enclosure.

Exhaust Venting and Inlet Combustion Air Duct—The flue exhaust 601 is located on the top of the cabinet 600. The Inlet Combustion Air Duct 603 is also located on the top of the cabinet 600 (FIG. 6).

Gas Inlet—Where the water heater is fueled by a gas, typically a natural gas, there is a gas fuel inlet. In the exemplary apparatus, the gas inlet 1011 is located about top center of the rear panel 1010 (FIG. 10).

Water Connections—In the exemplary apparatus of FIG. 10, the water connections are in the vertical arrangement on the right side of the rear panel 1010. From bottom to top of the water connections on the rear panel 1010, are the cold water inlet 181, the recirculated water 183, the tempered hot water out, HT Supply 133, and the domestic water out LT Supply 131.

Drain Connection—The drain for the blow down valve 121 is shown as blow down valve drain 1017 (FIG. 10). The three way valve 501 drains through the drain 505. There can also be a condensate drain 1019.

FIG. 11 is a drawing showing a summary schematic of the water heating and treatment system described hereinabove. Systems that can be controlled by dedicated subsystem controllers can include (See also FIG. 1) the water heater 110, mixing valve (e.g. digital mixing station 160), UV lamps (e.g. UV water treatment lamp (A) 135, and UV water treatment lamp (B) 137), and the anti-scale system 141, such as, for example, an AquaSolve™ Template Actuated Crystallization (TAC) anti-scale unit available from PVI, Watts Regulator Co. of N. Andover, Mass.

Co-Located Subsystem Controllers

In the prior art, subsystem controllers were typically mounted to the physical subsystem itself. The subsystem controllers then communicatively coupled to a main controller, if there was one. It was realized that physically co-locating the subsystem controllers in the front of the cabinet makes it much easier and more efficient to maintain, troubleshoot, and repair a unit. With the subsystem controllers physically located in the front of the cabinet, they can be easily accessed by front door access alone, where the subsystems may be located in more difficult to access regions of the interior of the cabinet.

FIG. 12 is a drawing showing an exemplary block diagram of a plurality of subsystem controllers of a water heating and treatment system, which are communicatively coupled to a main supervisory controller 1901. Controllers for the various subsystems have been co-located in the front of the cabinet and those controllers are now accessible by opening the front door. Typical subsystem controllers of a water heating and treatment system according to the Application include water heater controller 19110, mixing valve controllers (e.g. digital mixing station controller 19160), UV lamp controller 19135, UV lamp controller 19137, and anti-scale system controller 19141. Other subsystems can include battery backup and lighting controls 19191, breakers and I/O 19193, and an I/O subsystem 19195. Sensor (e.g. temperature, flow rate, position, interlock, etc.), interlocks, simple controls, etc. can be wired to any suitable I/O subsystem.

FIG. 13 is a drawings showing an exemplary water heating and treatment system according to the Application where the controllers are now mounted in the front of the cabinet, just behind the front door. The front door assembly has been removed in FIG. 13 to allow an unobstructed view of the inside front portion of cabinet 600 with the subsystem controllers in full view.

The supervisory controller can be a tablet style computer or controller mounted in the front door with its screen visible in the front surface of the front door when the front door is closed. FIG. 5 shows an exemplary Element Q™ water heating and treatment system, the Lync™ by WATTS™, where the touch screen of the supervisory controller can be seen mounted in the front door of the cabinet (e.g. cabinet 600, FIG. 5). A keyboard can also be present, such as, for example, in an opening compartment in the front of the door which can also serve as a base for keyboard use.

FIG. 14 is a drawing of an exemplary system status graphical user interface (GUI) displayed on the supervisory controller 1901. Subsystems are shown along with associated working parameters, such as setpoint and measured temperatures.

FIG. 15 is a drawing of another exemplary system status graphical user interface (GUI) displayed on the supervisory controller 1901. In FIG. 15, the supervisory controller 1901 is displaying a high temperature alert condition. As seen along the lower edge of the system status display of FIG. 15, there can be other pages or screens to operate, control, and monitor, infection control routines, sanitation routines, maintenance routines, and settings.

Pressure Sensors

There can be two pressure sensors located across each sediment filter to measure the differential pressure (one pressure sensor on either side of a sediment filter). If the pressure drops exceed the set point, then an alert can be sent to the water heater controller telling the user to replace the media. The media (e.g. an AquaSolve™ media) should be replaced every 3 years.

Temperature Sensors

As described hereinabove, and now in more detail with respect to an exemplary Element™ unit, temperature sensors distributed within an exemplary Element™ unit similar to the water heating and treatment system of FIG. 4A. Each temperature sensor can play an important role to the safety and efficiency of the system. Temperature sensors are used in the sanitation pump, thermal disinfection and scald protection processes.

A temperature sensor (Tx) is located at the cold-water inlet (e.g. I-44, FIG. 4A). This sensor can be used to measure the temperature of the cold-water supply coming into the unit and warn user if the temperature is above the standard requirements. A temperature sensor (T1) is located near the recirculation water line to measure the temperature of the recirculation water coming back into the unit (e.g. I-40, FIG. 4A). A temperature sensor (T2) is located near the base of the water heater inlet to measure the temperature inside the tank (e.g. I-47, FIG. 4A). A temperature sensor (T3) is located at the hot water outlet (e.g. I-36, FIG. 4A). A temperature sensor (T4) is located at the tempered water outlet (e.g. I-41, FIG. 4A).

Software or firmware of processors, controllers, and computers that can be used to implement a water heater, a digital mixing station, a UV lamp and an anti-scale water treatment water heater apparatus with sanitation loop of FIG. 1 can be provided on any suitable computer readable non-transitory storage medium. A computer readable non-transitory storage medium as non-transitory data storage includes any data stored on any suitable media in a non-fleeting manner. Such data storage includes any suitable computer readable non-transitory storage medium, including, but not limited to hard drives, non-volatile RAM, SSD devices, CDs, DVDs, etc.

It will be appreciated that variants of the above-disclosed and other features and functions, or alternatives thereof, may be combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims. 

What is claimed is:
 1. A water heating and treatment system comprising: a water heater operatively coupled to a water heater controller; a hot water outflow line from said water heater; a cold water supply line to supply water to said water heater, said cold water supply line comprising at least one of an anti-scale device operatively coupled to an anti-scale device controller, and at least one sanitation device operatively coupled to a sanitation device controller; and a mixing station to supply a temperature regulated heated water to one or multiple temperature zones, said mixing station fluidly coupled to said cold water supply line and to the hot water outflow line from said water heater, said mixing station operatively coupled to a mixing station controller, said mixing station to supply heated water to at least a first temperature zone at a first hot water temperature, wherein controllers of said water heater controller, said anti-scale device controller, said sanitation device controller and said mixing station controller are co-located at a front of a single enclosure behind an openable door, said controllers operatively coupled to a supervisory controller.
 2. The water heating and treatment system of claim 1, wherein said supervisory controller is disposed in said openable door.
 3. The water heating and treatment system of claim 1, wherein a display screen of said supervisory controller is viewable when said openable door is closed.
 4. The water heating and treatment system of claim 1, wherein a display screen of said supervisory controller displays at least one graphical user interface showing a symbol representative of a plurality of components of components of said water heating and treatment system selected from: said water heater, said anti-scale device, said at least one sanitation device and said mixing station.
 5. The water heating and treatment system of claim 4, wherein said at least one graphical user interface shows an operating parameter of each of said components, said operating parameter displayed adjacent to said symbol representative of a plurality of components of components of said water heating and treatment system selected from: said water heater, said anti-scale device, said at least one sanitation device and said mixing station.
 6. The water heating and treatment system of claim 1, wherein said sanitation device comprises a UV sanitation lamp.
 7. A water heating and treatment system comprising: a water heater; a hot water outflow line from said water heater; a cold water supply line to supply water to said water heater, said cold water supply line comprising at least one of an anti-scale device, and a sanitation device; a mixing station to supply a temperature regulated heated water to one or multiple temperature zones, said mixing station fluidly coupled to said cold water supply line and to the hot water outflow line from said water heater, said mixing station to supply heated water to at least a first temperature zone at a first hot water temperature; and a three-way return water diverter valve comprising a proportional three-way return water diverter valve fluidly coupled to said mixing station via one or more sanitation components, and wherein an operation of said three-way return water diverter valve is based on a differential temperature between a first temperature zone temperature sensor and a hot water recirculation temperature sensor.
 8. The water heating and treatment system of claim 7, wherein said proportional three-way return water diverter valve is fluidly coupled to a drain or to another use, via a drain line or a diverted water line, said three-way return water diverter valve to provide a portion of a re-circulated hot water from a hot water recirculation line comprising a hot water recirculation temperature sensor to said mixing station and a remaining portion of the re-circulated hot water to said drain.
 9. The water heating and treatment system of claim 7, wherein said sanitation device comprises a UV sanitation lamp.
 10. A water heating and treatment system comprising: a water heater; a hot water outflow line from said water heater; a cold water supply line to supply water to said water heater, said cold water supply line comprising at least one of an anti-scale device, and a sanitation device; and a mixing station to supply a temperature regulated heated water to one or multiple temperature zones, said mixing station fluidly coupled to said cold water supply line and to the hot water outflow line from said water heater, said mixing station to supply heated water to at least a first temperature zone at a first hot water temperature, wherein a pressure sensor is disposed across each sediment filter to measure a differential pressure, and wherein a media replacement alert is generated if the differential pressure drop exceeds a set point.
 11. The water heating and treatment system of claim 10, wherein said sanitation device comprises a UV sanitation lamp.
 12. The water heating and treatment system of claim 10, wherein said media replacement alert is sent to a water heater controller.
 13. The water heating and treatment system of claim 12, wherein said water heater controller is operatively coupled to a supervisory controller and said media replacement alert is displayed on a display of said supervisory controller.
 14. A water heating and treatment system comprising: a water heater; a hot water outflow line from said water heater; a cold water supply line to supply water to said water heater, said cold water supply line comprising at least one of an anti-scale device, and a sanitation device; and a mixing station to supply a temperature regulated heated water to one or multiple temperature zones, said mixing station fluidly coupled to said cold water supply line and to the hot water outflow line from said water heater, said mixing station to supply heated water to at least a first temperature zone at a first hot water temperature, wherein water temperatures within said water heating and treatment system are measured by any combination of a plurality of temperature sensors comprising: a temperature sensor at a cold-water inlet, a temperature sensor at a recirculation water line, a temperature sensor near an inlet of said water heater, a temperature sensor at a hot water outlet, and a temperature sensor at a heated water outlet of said at least a first temperature zone.
 15. The water heating and treatment system of claim 14, wherein a sanitation pump process is based on temperature readings of said combination of a plurality of temperature sensors.
 16. The water heating and treatment system of claim 14, wherein a thermal disinfection process is based on temperature readings of said combination of a plurality of temperature sensors.
 17. The water heating and treatment system of claim 14, wherein a scald protection process is based on temperature readings of said combination of a plurality of temperature sensors.
 18. The water heating and treatment system of claim 14, wherein said sanitation device comprises a UV sanitation lamp. 